cc: Construct the RSLL without using layer hierarchy

cc/layers/render_surface_impl.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_LAYERS_RENDER_SURFACE_IMPL_H_
 #define CC_LAYERS_RENDER_SURFACE_IMPL_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 43 matching lines @@
     draw_properties_.draw_opacity = opacity;
   }
   float draw_opacity() const { return draw_properties_.draw_opacity; }
 
   void SetNearestOcclusionImmuneAncestor(RenderSurfaceImpl* surface) {
     nearest_occlusion_immune_ancestor_ = surface;
   }
   const RenderSurfaceImpl* nearest_occlusion_immune_ancestor() const {
     return nearest_occlusion_immune_ancestor_;
   }
+  RenderSurfaceImpl* nearest_occlusion_immune_ancestor() {

[weiliangc, 2016/04/19 15:05:59]

Is this non-const version really needed?

[ajuma, 2016/04/19 16:35:13]

Removed. Turns out I just needed to make SetNearestOcclusionImmuneAncestor take
a const pointer.

+    return nearest_occlusion_immune_ancestor_;
+  }
 
   SkColor GetDebugBorderColor() const;
   SkColor GetReplicaDebugBorderColor() const;
 
   float GetDebugBorderWidth() const;
   float GetReplicaDebugBorderWidth() const;
 
   void SetDrawTransform(const gfx::Transform& draw_transform) {
     draw_properties_.draw_transform = draw_transform;
   }
@@ skipping 145 matching lines @@
   int target_render_surface_layer_index_history_;
   size_t current_layer_index_history_;
 
   friend class LayerIterator;
 
   DISALLOW_COPY_AND_ASSIGN(RenderSurfaceImpl);
 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_RENDER_SURFACE_IMPL_H_